Costal cartilage graft for an unstable post-traumatic trapeziometacarpal intra-articular malunion in a pediatric patient: a case report.

Trapeziometacarpal dislocation is a rare traumatic lesion, especially in the pediatric population. Various treatments have been described for acute cases. We report the case of a 15-year-old boy who was admitted in the emergency department with chronic post-traumatic trapeziometacarpal dislocation due to an untreated first metacarpal base fracture (Bennett), with complete articular destruction. The patient was treated by open reduction, interposition of a costal cartilage graft, and intermetacarpal K-wire fixation. Follow-up at 2 years after the surgery showed excellent clinical and radiological results. This surgical technique had not been described previously in the pediatric population.